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특허-제10-1798941호 펌프 효율 향상용 체크밸브
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특허-제10-1798941호 펌프 효율 향상용 체크밸브
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특허_제10-2185931호 수밀성 강화기능을 구비한 수...
특허-제10-2125943호 침전지 플러싱 버터플라이밸브
특허-제10-2125942호 여과지 정류 버터플라이밸브
특허-제10-2204949호 회전제한수단을 구비하는 버터...
특허-제10-1969981호 디스크 위치확인 및 제어기능...
특허-제10-1798941호 펌프 효율 향상용 체크밸브
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